Riveting tool



H. J UNKERS RIVETING TOOL Jan. 5, 1932.

Filed Sept. 27, 1929 /n venon: Haya fan/feras Patented Jan. 5,L 1932UNITED STATES PATENT OFFICE RIVETING TOOL Application tiled September27, 1929, Serial No. 395,601, and in Germanyctobcr 24, 1928.

other by means of rivets. The invention has particular reference to themeans whereby a closing head is formed on hollow pot-shaped rivets, i.e. tubular rivets closed at one end and fianged at the' other. It is anobject of my invention to provide a .riveting tool of particularsimplicity and efficiency. The tool according to this inventionsubstantially consists in two or more resilient jaw-like membersarranged opposite each other or in a circle, each member having the formof a resilient tongue and the tongues of the tool having a tendency toclose upon each other, Each tongue may be provided on the inner sidewith a cam face, while on the outer side is formed a projection. Inorder to form a closing head the ends of the (1o-operating tongues areintroduced into the hollow rivet, which is placed in position in theregistering holes of the parts to be connected, and a wedge-like memberis forced into position between the tongues so las to force themoutwardly. whereby the projections formed on the tongues will act on theclosed end of the rivet and will expand it to form the closing head.After y the wedge-like member has been withdrawn from between thetongues, they will owing to their resiliency return into their initialposition, when they can readily be withdrawn from the rivet. By turningthe tongues in the rivet after the first operation and repeatedlyforcing the wedge in between them, the closing head can be perfected.

In the drawings affixed to this specification and forming part thereof.a tool embodying my invention is illustrated diagrammatically by Way ofexample.

In the drawings Figs. l and 3 are vertical sections showing the tool ininoperative and operative positions, respectively,

Figs. 2 and 4 are cross sections on the line II-II in Fig. l and IV--IVin Fig. '3, respectively,

Fig. 5 is a sectional elevation of the tool as a whole, drawn to asmaller scale.

Referring to the drawings, a and b are the work-pieces, for instance twopieces of sheet metal, and l is a hollow rivet inserted in registeringholes formed in these pieces. 2 and 3 are two levers pivoted to eachother at 4 and spread asunder by a spring 5. To lever 2 are attachedresilient tongues 6 and 7 the free ends of which converge so that camfaces are formed on their inner sides, while proj ections 9, 10 areformed on the outer sides near the ends of the tongues. Theseprojections are-of a size which permits the tongues in inoperativeposition to be introduced into and withdrawn from the rivet. Between thetongues 6 and 7 is slidably located a wedge 8, the lower end of which isrounded, while the upper end is hinged at 13 to the lever 3 in suchmanner, that in the position of the 1evers as shown in Fig. 5 the wedge8 is in the inoperative position shown in Fig. 1. On the levers 2 and 3being forced against each other wedge 8 is forced in the direction ofthe ends of the tongues 6 and 7 and in gliding on the inner cam faces ofthe tongues forces their free ends asunder. The projections 9 and 10acting on the rivet wall from wit-hin expand it to form the closinghead. On the levers 2 and 3 being released spring 5 will force themasunder so that wedge 8 is withdrawn from between the tongues 6 and 7 sothat their ends can-move inwardly and the tool can be withdrawn from therivet or turned in the rivet in order to repeat its operation. y

Instead of two tongues three or four may be provided which can all beacted upon by a single wedge.

I wish it to be understood that I do not desire to be limited to theexact details of construction shown and described for obviousmodifications will occur to a person skilled in the art.

In the claim affixed to this specification no selection of anyparticular modification of the invention is intended to the exclusion ofother modifications thereof and the right to subsequently make claim toany modification not covered by these claims is expressly reserved. f

Iclaim:

1. A tool for forming closing heads on hol- 5 low rivets comprising apair of resilient touffues with convergin ends, projections on sai ends,and means or forcing said ends outwardly, said means being displaceablebetween said ton es towards, but barred from 10 `moving beyon said ends.

2. A tool for forming closin heads on hollow rivets comprising a pair olevers pivoted to each other, a air of resilient tongues kfixed to oneof said evers, the free ends of said 15 tongues ooverging, projectionson said ends, and a wedge-like member connected with said other leverand extending into the gap between said tongues.

In testimony whereof I aix my signature.

2 HUGO J UNKERS.

